Mold for cement blocks and walls.



O. A: TORRANGE. MOLD FOR CEMENT BLOCKS AND WALLS.

APPLICATION FILED JUNE 8, 1909.

Patented Ma1t29, 1910.

MGLD F812. CEMENT BLOCKS AND W'ALLS.

Specification of Letters Patent.

iiatented "star, 2% thi d.

Application filed June 8, 1909. Serial No. 561,298.

To all whom it may; concern:

Be it known that 1, Criannns ii. Tonnanon, a citizen of the UnitedStates, residing in Gibbon, county of Buil'alo, State of Nebraska, haveinvented an Improvement in Molds for Cement Blocks and Walls, of whichthe following is a specification.

My invention is an improved collapsible core, for use in molding hollowcement blocks and building walls.

The details of construction, arrangement, and combination of parts areas hereinafter described, and illustrated in the accompanying drawing inwhich Figure 1 is a longitudinal section of my improved collapsiblecore. Figs. 2 and 3 are sections on the lines 23 of Fig. 1, but showingthe core collapsed in one case and expanded in the other.

The body of the core is constructed of thick sheet-iron, preferablygalvanized iron, and in two parts, 1, 2, which are troughshaped and oneadapted to receive the other, the two being thus practically telescopedas will be understood from reference to Figs. 2, 3. The two parts 1, 2,are pivoted to gether by bolts or screws 3 applied at the top. A block14 is arranged at that point and extends between the sides of the core,and through said block passes a rod 6 having a handle 6 for rotating it.This rod 6 extends nearly to the bottom of the hollow core and is thereprovided with a transverse ovalshaped plate or bar 7. The latter isconnected by spring rods 8 and 9 with the narrower sides of the core.The rods are provided with coils to increase their resiliency and theirouter ends pass through holes in the core sides 1, 2. The coils areformed adjacent to the sides of the core and rest in contact with it,thus serving as shoulders or points of impact when the rod 6 is rotatedfor expanding the core.

In order to brace and strengthen the wider sides of the parts 1, 2, theyare connected by a headed screw or rivet a which passes through anarc-slot 5, and they are further connected by an upturned lip or flange12, which is formed on the bottom of part 1 and receives the lower edgeof part 2. When the sides 1, 2, are collapsed as indicated in Figs. 1,2, the flanges 12 may engage shoulders 10 and thus serve as stops.

The operation of my invention will now be understood from the followingdescription. In building a hollow cement wall or in forming hollowcement building block, the body ot the mold employed being placed inpositlon, my collapsible core is then adj usted in place in the center01 the same and will carry the cross bar 7 to the diagonal positionindicated ini ig. 3; tien plastic cement is poured into the mold, ormoldbox, around tle core, and when the same has set or hardened, thecore is collapsed to enable it to be withdrawn. In order to thuscollapse it, the handle 6 is turned the reverse of its former rotation,by which the bar 7 carried by the rod 6 is turned to the position shownin Figs. 1 and 2, whereby the spring rods 8 and 9 pull the sides 1, 2,of the core toward each other, as will be readily understood. Thus ahollow space conforming to the shape and size of the core will be formedin the walls or block, and will subsequently serve as an air chamber. Inconstructing the hollow wall, after the first layer of cement has beenthus made and provided with openings by means of the core, as described,the lower end of the core is placed in the upper end ot' the openingformed in the previous operation, and then an additional quantity ofplastic cement is poured in and left to harden, as before. By continuingin this manner, a hollow wall may be built up to any required height.

In practice, when the cross bar 7 on the rod 6 is adjusted for openingthe core to its fullest extent, as shown in Fig. 3, the rounded ends ofthe said bar come in contact with the inner sides of the core part 2 andthus brace and support both sides of parts 1, 2, against the pressure ofthe ce ment which is poured in around the core.

-What I claim is:

1. The improved collapsible core comprising two hollow telescopic partsconstructed of thin metal, and pivoted together at their upper ends, atop cross bar extending between the same, a rotatable rod passingthrough said cross bar and having its lower end provided with a crossbar, and spring rods connecting said bar with the narrower sides of thecollapsible core and provided, adjacent to the said sides, withshoulders, whereby, when said rod is rotated, the telescopie parts maybe adjusted in either direct-ion for expanding or collapsing the core,as shown and described.

"2. The improved collapsible core comprising two sheet metal parts whichare troughshape and arranged for telescoping described, the same beingpn'oted together at their upper ends and provided centrally with 21vconnection comprising a headed rivet which is slidable in a slot andconnected at their lower ends by a lip or flange l0

